That is the issue.
The apps from Google, the manufacturer of Android, and, in your case, Samsung, the manufacturer of your hardware, are developed by the “gatekeepers” of Android itself and are classified as trustworthy. These and the apps from a very few big players on the software market, Microsoft and Adobe, can and are allowed to communicate from app to app.
I’ve written about this before, if you’d like, you can find it in the linked post and in the linked posts you’ll find there:
Call it an unholy alliance if you like. You have to look hard to find out more about it, but it’s mainly due to Android’s security issues, which Google willingly and knowingly accepted in the early days of Android just to be able to somewhat compete with Apple’s iOS and generate market share.
And today, as Google is openly blamed for these security flaws, they are nailing every newly reported vulnerability in Android, from version to version, you have less and less of your often very expensive and powerful hardware.
Michelist